Trimming attachment for stitching-machines.



ofA. BONNEY.

TRIMMING ATTAGHMENT FOR STITGHING MACHINES.

APPLICATION FILED SEPT. 28,1908.

Patented Aug. 3, 1909.

CHARLES A. BONNEY, OF ST. LOUIS, MLSSOURI.

TRIMMING ATTACHMENT FOB STITCHINGMACHINE$.

Specification 01 Letters Patent.

Patented 3, 190".

Application filed September 28, 1908. Serial No. 455,190.

To all ill/10m it may mourn:

Be it known that l, (n.una-zs A. llnxitur, aeitizen of the United States. and resident of St. Louis, .ltissouri. have invented certain new and useful Improvements in 'lrimmin pilltltlltlltlllfi for fillitliliuil" Maehines. ()if whit-h the. tollowing is a sperilieation.

This imention relates to improvements in a trimming attaehnu-nt l'or stitrhing mai-hiues, and has for its ohjeel to provide a rotary adjustable cutting: disk in proper relation with the needle of a stitching mat'hine so that the edge of the material is simultaneous'ly cut ott' during the act of stitching.

In the drawingsl igure 1 is a side elevation of a sewing machine with a part broken awa and in section, showing the application of my invention thereon. Fig. 2 is an enlarged detail seetional view of the lower portion at the saunin \Ylilt'lt the rotary cut ting; disk is supported. Fig. 2-3 is an end view of the same showing in dotted lines the rotting disk in a tilted position. Fig. -l is a detail perspertive view of the cuttingdisk and shuttle plate showing the. same in their relative operative position. Fig. 5 is a detail view of the adjusting plate made use of in eonneetion with my invention. Fig. (3 is a detail perspertive view of a strip of material in the act at being stilt-lied and the outline plate for trimming the edge of the same.

Referring to the drawings in detail. 7 indicates the head oi an ordinary stitching maehine in which is supported and operatively mounted the needle chuck 8. On the head is a projecting lugr 9 to which is pivotally connected an arm 10 carrying a guide roller 11.

\ On the bottom of the head 7 is suitably attached a bracket. 12 on which is supported a shaft 1 3 the upper end of said. shaft being provided with the beveled pinion 1% which arranged to mesh with a bevel gear 15 .umunted upon. the shaft. 16 'arried in the head of the machine and operated by the usual belt passing over the sheave '17. The, bottom end of the. shaft 13 is provided with a beveled pinion it; which meshes with a beveled pinion It) supported on a short shaft 20. This shaft is rotatably mounted in a hearing 21 and on the outer end of said shaft is suitably attached a rotary cutting disk 22. This cutting disk may be attached to the end of the shaft by a screw thread or keyed thereon as found most. desirable on the shaft it). Between the bearins 2t. and the rear surl at'e of the outlin disk is located an CX- pansive coil spring 5 which permits the shaft '10 to which the cutting; dial. is attached to have sutlieient lateral movement in the heariugfit, depending upon the width and the position of the throat-plate i l.

The hearing .21 is provided with a projeetjing' frame 2.) \Vlllt'll is hingedtv attaehetl at the point indicated by the numeral .26 to the casing 27 forming part of the bracket 12 and to the said frame 27 and the bracket l2 is connected a spring 28 by which the sat ting disk together with its shaft and hearing may be placed in a position shown by dotted lines: in Fig. 3 when it is (haired to place the :same out of use. in order to support the cutting disk. its shaft and hearing in an operative position. i plate a tool'- ing bolt: 29 on the rear end of the easing 27, the head of said bolt projeetingr into the Frame. \vhile'the opposite end of said boltis attached to a linger lever 30 which by pressing rearwardly will release the head of the bolt from the recess in the easing, permitting the entire cutting disk and its meeh anism to rise in a position shown by dotted. lines in Fig. The plate Sit \Vllltll is located on the rear side-0t the ezw l g' is provided with a pair oi. diapinal elongated slots 31; through which are passed the cap screws 11?; and this arrangement for the purpose of permitting the shaft Jo and its cutting disk to be tilted at an anglett'ouud desirable and most operative.

()n the eloth plate 34 and to one side of the throat-plate is pivedally mounted a presser-plate 35 having; a flattened surfacev 36 which is arranged to come in contact with the rear edge of the eutting disk (see Fig. i), the said presserplate being held in position bya spring; 37 located between the throat plate and. the presser plaie m that the presser-plate exerts a constant pressure upon the euttingalisk 322, to hold. the lower cutting edo oi said disk 22 in eonsrtant contact \vitn the upper edge of the kni'leblade 36.

(in the throat-plate 2.4. is attaehed a knife blade 38 with which eontaet.s the outline; edge of the rutting disk This blade is constructed of chilled material so as not to \V0tl1-dtt1l1lg the continuous; contacting of the rotary cutting disk.

Having fully described my invention, What I claim as new an; desire to have secured to me by the grant-{gt Letters Patent, is:

1. A cutting attachment for stitching machines comprising a stitching machine provided with a cloth-plate; a throat-plate mounted on said cloth-plate; a knife blade vertically secured to said. throat-plate; a resser-plate pivotally mounted on said cloth-plate; a rotary cutting disk seated between said knife blade and said presserplate; and means for revolving said rotary cutting disk, substantiallyas described.

' 2. In a cutting attachment for stitching 'machines, the combination of a rotary cutting dislt; a shaft carrying said disk; a bevel gear mounted on said shaft; a second bevel gear fixedly mounted; means tor rotating said second bevel gear; a pivotally mounted bracket whereby said gears are brought into or out of contact with each other; a clothplate; a throat-plate mounted on said clothplate; and a knife blade vertically mounted -on said throat-plat'e, substantially as described.

3. A cutting attachment for stitching machines comprising a stitching machine pro-' vided with a cloth-plate; a throat-plate mounted on said cloth-plate; aknife blade vertically secured to said throat-plate; a presser-plate cloth-plate seated between said presserqalate; means for revolving said rotary cutting disk; and means for throwing said rotary cutting disk out of its normal position between said knife blade and said l l l l l a rotary cutting disk normally pressenplate, substantially as described.

In testimony whereof, I have signed my name to this specification, in pl'th'tlltt of two subscribing witnesses.

CHARLES A. mnx'sur.

l \Vitnesscs Amman A. Fncns,

\VaI/rnn (I. STniN.

pivotally mounted on said knife blade and said. 

